Marinated salad with cabbage, apple and walnuts

https://www.argiro.gr/recipe/marinarismeni-salata/

Ingredients

1kg cabbage
2 apples (1 green and 1 red)
1 tbsp salt
1 small red onion, thinly sliced
⅓ cup olive oil
¼ cup vinegar
¼ cup sugar
1 tbsp mustard
½ tsp red pepper flakes
1 cup walnuts, thickly chopped
1 cup pomegranate seeds
secret ingredient: add 1 tsp walnut butter in the dressing 

Preparation

Thinly chop the cabbage, add salt, and press it lightly to remove the juices. Pour it into the salad bowl. Wash the apples, leaving the skin on, but removing the heart and stems. Slice them into the julienne cut and add them to the cabbage. Add the onion, walnuts and pomegranate seeds. In a blender, mix the olive oil, vinegar, sugar, mustard, red pepper flakes and walnut butter (optional), then pour over the salad and stir.